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预防煤和瓦斯突出的区域性和局部性措施,预测煤层突出危险性的一些方法都基于预先打钻.多年的经验表明,在突出危险煤层中打钻的过程中和在采煤时有钻孔的条件下,均发生过突出.1952～1985年间,在利用了不同直径的钻孔的条件下发生过185次突出.在打直径为60毫米以上的钻孔时突出的频率P_i是最大的(0.025).统计分析可以确定,在采深H和突出频率P_i之间存在着一定的关系(图1),还可以确定煤体深部从工作面起到突出发生地点的突出几率最小的深度l*与钻孔直径d的关系(图2).从频率分布图中可以看出,随着H的增加,打钻时的煤和瓦斯突出的频率也增加,而l随着d的增加而减小.由于利用超前钻孔时突出的次数增加了,所以其使用量从1970年起开始减少.因此,分析打钻时突出发生的条件表明,突出发生的几率取决于采矿技术因素.
Some of the ways in which coal and gas outburst regional and local measures can be taken to predict salient outburst of coal seams are based on pre-drilling. Years of experience have shown that drilling during the drilling of salient dangerous seams and during coal mining , Prominence occurred in 1985. Between 1952 and 1985, 185 prominences occurred with holes of different diameters, and P_i, which was prominently pronounced when perforating a hole with a diameter of 60 mm or more 0.025) .Through statistical analysis, it can be determined that there is a certain relationship between mining depth H and the protruding frequency P_i (Fig. 1), and the depth l * with the lowest prominence of the deep coal body from the working face to the prominent place of occurrence And borehole diameter d (Figure 2) .From the frequency distribution, it can be seen that with the increase of H, the frequency of coal and gas outburst during drilling also increases, and l decreases with the increase of d As the number of prominences increased with advance drilling, their use has decreased since 1970. Therefore, the analysis of the conditions that have occurred during drill drilling shows that the probability of occurrence is dependent on the mining technology.